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graphics: Reduce calls of glUniformMatrix4fv

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This commit is contained in:
Hajime Hoshi 2016-06-05 23:32:25 +09:00
parent 26ef56232b
commit 33b50ed294
2 changed files with 23 additions and 13 deletions
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26
image.go
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@ -252,6 +252,10 @@ func (i *imageImpl) Fill(clr color.Color) error {
return f()
}
func isWholeNumber(x float64) bool {
return x == float64(int64(x))
}
func (i *imageImpl) DrawImage(image *Image, options *DrawImageOptions) error {
// Calculate vertices before locking because the user can do anything in
// options.ImageParts interface without deadlock (e.g. Call Image functions).
@ -270,18 +274,22 @@ func (i *imageImpl) DrawImage(image *Image, options *DrawImageOptions) error {
}
geom := &options.GeoM
colorm := &options.ColorM
dxf := geom.Element(0, 2)
dyf := geom.Element(1, 2)
scaleX := geom.Element(0, 0)
scaleY := geom.Element(1, 1)
dx := geom.Element(0, 2)
dy := geom.Element(1, 2)
// If possible, avoid using a geometry matrix so that we can reduce calls of
// glUniformMatrix4fv.
if geom.Element(0, 0) == 1 && geom.Element(1, 0) == 0 && geom.Element(0, 1) == 0 && geom.Element(1, 1) == 1 && (dxf != 0 && dyf != 0) {
if dxf == float64(int64(dxf)) && dyf == float64(int64(dyf)) {
dx := int(dxf)
dy := int(dyf)
if isWholeNumber(scaleX) && geom.Element(1, 0) == 0 &&
geom.Element(0, 1) == 0 && isWholeNumber(scaleY) &&
isWholeNumber(dx) && isWholeNumber(dy) {
if scaleX != 1 || scaleY != 1 || dx != 0 || dy != 0 {
parts = &transitionImageParts{
parts: parts,
dx: dx,
dy: dy,
parts: parts,
scaleX: int(scaleX),
scaleY: int(scaleY),
dx: int(dx),
dy: int(dy),
}
geom = &GeoM{}
}

10
imageparts.go
View File

@ -126,9 +126,11 @@ func (t *textureQuads) vertices(vertices []int16) int {
}
type transitionImageParts struct {
parts ImageParts
dx int
dy int
parts ImageParts
scaleX int
scaleY int
dx int
dy int
}
func (t *transitionImageParts) Len() int {
@ -137,7 +139,7 @@ func (t *transitionImageParts) Len() int {
func (t *transitionImageParts) Dst(index int) (int, int, int, int) {
x0, y0, x1, y1 := t.parts.Dst(index)
return x0 + t.dx, y0 + t.dy, x1 + t.dx, y1 + t.dy
return x0*t.scaleX + t.dx, y0*t.scaleY + t.dy, x1*t.scaleX + t.dx, y1*t.scaleY + t.dy
}
func (t *transitionImageParts) Src(index int) (int, int, int, int) {